A Review of NASA's 'Atmospheric Effects of Stratospheric by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Panel on Atmospheric Effects of Aviation

The NRC Panel at the Atmospheric results of Aviation (PAEAN) used to be tested to supply suggestions to NASA's Atmospheric results of Aviation software (AEAP) by way of comparing the appropriateness of the program's learn plan, appraising the project-sponsored effects relative to the present kingdom of medical wisdom, deciding on key clinical uncertainties, and suggesting examine actions prone to decrease these uncertainties.

Over the previous couple of years, the panel has written periodic studies of either the subsonic aviation (Subsonic Assessment-SASS) and the supersonic aviation (Atmospheric results of Stratospheric Aircraft-AESA) elements of AEAP, together with: An meantime overview of the Subsonic evaluation venture (1997); An period in-between evaluate of AEAP's Emissions Characterization and Near-Field Interactions parts (1997); An meantime assessment of the AESA undertaking: technology and growth (1998); Atmospheric results of aviation: A evaluate of NASA's Subsonic overview undertaking (1998). This document constitutes the ultimate overview of AESA and may be the final record written by means of this panel. the first viewers for those studies is this system managers and scientists affiliated with AEAP, even though at times the subjects mentioned are of curiosity to a much wider audience.

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It is also recommended that additional emphasis be placed on sulfur emissions. Improved understanding is needed of the chemistry and kinetics of fuel sulfur combustion in the engine, and sulfur particle formation in the near-field exhaust plume. Also, if fuel sulfur levels decrease over the next few years, as predicted, then some type of lubricant may need to be added to the fuel to offset the lost sulfur. The nature of any replacement lubricant and its impact on the atmosphere must be assessed.

Page viii The panel met three times to work on this particular evaluation. At these meetings, the panel received detailed briefings from the managers and lead scientists of AESA and from a wide variety of experts (from both inside and outside of NASA) on the different topics covered by this evaluation. We are grateful to all these people for the time they took to assist the panel in its work. Finally, we appreciate the support provided by the NRC staff throughout this study. This report has been reviewed by individuals chosen for their diverse perspectives and technical expertise, in accordance with procedures approved by the NRC Report Review Committee.

More recently, attention has been given to the question of whether aircraft emissions could also affect the radiative balance of the atmosphere and thereby contribute significantly to global climate change. The history of research on this issue goes back to the early 1970s. S. Department of Transportation (DOT) was the lead agency in the development of an American supersonic transport (SST), in the face of competition from the Anglo-French Concorde and the former Soviet Union Tu-144. DOT commissioned the Climatic Impact Assessment Program (CIAP) in 1972.

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